GRIN1 and Alzheimer disease: Post hoc analysis revealed significantly better performances in AD patients carrying higher levels of natural anti-NMDAR1 autoantibodies than in AD patients carrying lower levels of natural anti-NMDAR1 autoantibodies in either WAIS-R Digital Symbol Test (Welch’s t-test, t= 2.4684, p=0.016) or Scaled WAIS-R Digital Symbol Test (Welch’s t-test, t= 2.4778, p=0.0157).